5 Anime Like Yosuga no Sora
Amagami SS is a romance anime based on a dating simulation game for the PlayStation 2. The series follows Tachibana Junichi, a high school student who got his heart broken by a girl he was supposed to date on Christmas Eve but didn’t show up. Since then, his days are spent inside his closet planetarium. One fateful day, he meets one of the prettiest girls in school, Morishima Haruka. They get closer with each passing day, until Junichi realizes he has become romantically interested in Haruka.
The show is divided into six four-episode arcs, each featuring the six main heroines to whom Junichi will have a special relationship.
Aki Sora features Aki Aoi and Sora Aoi, two siblings that have always had a special bond since their childhood. When he was young, Sora would always say the words “I love you” to his sister. It is only when they get older that they realize their true feelings for one another.
Knowing that their family and the rest of society will never accept their relationship, they decide to keep it a secret. However, Nami—Sora’s twin—sets him up with her best friend, Kana Sumiya. Sora begins to explore various relationships with different girls and questions his feelings toward Aki in the process.
Kiss x Sis
Kiss x Sis is another anime that revolves around siblings forming a taboo relationship. Keita Suminoe is a third year high school student who lives with his father, stepmother and two older twin stepsisters, Ako and Riko.
Since they are not related by blood with Keita, the twins pursue their lustful interests toward their stepbrother. Keita does his best no to fall for them, but when he enters the same school as the two, the temptation starts getting too hard to resist.
Boku wa Imouto ni Koi wo Suru
Boku wa Imouto ni Koi wo Suru (I’m in love with my sister) is a one-episode original video animation based on a hit manga series. The show focuses on fraternal twins Yori and Iku. Yori develops a romantic feeling toward Iku, but since they are siblings, he tries to control his emotions.
They share the same room, which only makes matters worse. When Iku admits to having a boyfriend, Yori loses it and finally confesses his true feelings. Iku doesn’t want his brother to go away, but Yori wants more from iku than just a loving sister.
School Days is an anime series adopted from a Japanese visual novel. Makoto Itou is a high school student of Sakakino Academy. He rides the train to and from school every day. Makoto develops a crush on fellow student Kotonoha Katsura, whom he sees during his daily commutes. Sekai Saionji is a common friend of the two and upon learning that Makoto likes Kotonoha, she introduces them to each other.
Sekai, however, soon finds herself jealous of the budding relationship between the two. One day, Kotonoha tells Sekai that he’s willing to do anything to repay her. Sekai then plants a kiss on his lips—leaving immediately and wishing him luck on his date with Kotonoha.